全文获取类型
收费全文 | 567篇 |
免费 | 90篇 |
国内免费 | 76篇 |
专业分类
航空 | 564篇 |
航天技术 | 66篇 |
综合类 | 72篇 |
航天 | 31篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 20篇 |
2021年 | 29篇 |
2020年 | 29篇 |
2019年 | 25篇 |
2018年 | 39篇 |
2017年 | 29篇 |
2016年 | 46篇 |
2015年 | 32篇 |
2014年 | 42篇 |
2013年 | 40篇 |
2012年 | 63篇 |
2011年 | 51篇 |
2010年 | 31篇 |
2009年 | 29篇 |
2008年 | 35篇 |
2007年 | 24篇 |
2006年 | 29篇 |
2005年 | 28篇 |
2004年 | 19篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 11篇 |
2000年 | 8篇 |
1999年 | 10篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 7篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有733条查询结果,搜索用时 15 毫秒
451.
通用CAPP系统结构及其实现方法 总被引:2,自引:0,他引:2
在阐述通用CAPP(Computer-aided process planning)系统应满足的条件和需要解决的问题的基础上,针对目前CAPP系统存在的不可移植、开发成本高等缺陷,对工艺信息属性进行了分析,采用软件框架与处理方法分离,对系统进行初始化、流程苑点的可重构等策略,提出通用CAPP系统的功能与结构。给出了资源适配器的构造方法和规则学习、更新、扩充的实现方法,经在AutoProcess系统 相似文献
452.
We consider reliability engineering in modern civil aviation industry, and the related engineering activities and methods. We consider reliability in a broad sense, referring to other system characteristics that are related to it, like availability, maintainability, safety and durability. We covered the entire lifecycle of the equipment, including reliability requirement identification, reliability analysis and design, verification and validation of reliability requirements (typically involved in the equipment design and development phase), quality assurance (which typically enters in the manufacturing phase), and fault diagnosis and prognosis and maintenance (which are connected to the operation phase). Lessons learnt from reliability engineering practices in civil aviation industry are given, which might serve as reference for reliability managers and engineers, also from other industries with high reliability requirements. 相似文献
453.
The James Webb Space Telescope 总被引:4,自引:0,他引:4
Jonathan P. Gardner John C. Mather Mark Clampin Rene Doyon Matthew A. Greenhouse Heidi B. Hammel John B. Hutchings Peter Jakobsen Simon J. Lilly Knox S. Long Jonathan I. Lunine Mark J. Mccaughrean Matt Mountain John Nella George H. Rieke Marcia J. Rieke Hans-Walter Rix Eric P. Smith George Sonneborn Massimo Stiavelli H. S. Stockman Rogier A. Windhorst Gillian S. Wright 《Space Science Reviews》2006,123(4):485-606
The James Webb Space Telescope (JWST) is a large (6.6 m), cold (<50 K), infrared (IR)-optimized space observatory that will be launched early in the next decade into orbit around the second Earth–Sun Lagrange point. The observatory will have four instruments: a near-IR camera, a near-IR multiobject spectrograph, and a tunable filter imager will cover the wavelength range, 0.6 < ; < 5.0 μ m, while the mid-IR instrument will do both imaging and spectroscopy from 5.0 < ; < 29 μ m.The JWST science goals are divided into four themes. The key objective of The End of the Dark Ages: First Light and Reionization theme is to identify the first luminous sources to form and to determine the ionization history of the early universe. The key objective of The Assembly of Galaxies theme is to determine how galaxies and the dark matter, gas, stars, metals, morphological structures, and active nuclei within them evolved from the epoch of reionization to the present day. The key objective of The Birth of Stars and Protoplanetary Systems theme is to unravel the birth and early evolution of stars, from infall on to dust-enshrouded protostars to the genesis of planetary systems. The key objective of the Planetary Systems and the Origins of Life theme is to determine the physical and chemical properties of planetary systems including our own, and investigate the potential for the origins of life in those systems. Within these themes and objectives, we have derived representative astronomical observations.To enable these observations, JWST consists of a telescope, an instrument package, a spacecraft, and a sunshield. The telescope consists of 18 beryllium segments, some of which are deployed. The segments will be brought into optical alignment on-orbit through a process of periodic wavefront sensing and control. The instrument package contains the four science instruments and a fine guidance sensor. The spacecraft provides pointing, orbit maintenance, and communications. The sunshield provides passive thermal control. The JWST operations plan is based on that used for previous space observatories, and the majority of JWST observing time will be allocated to the international astronomical community through annual peer-reviewed proposal opportunities. 相似文献
454.
G. Klingelhöfer J. Brückner C. D’uston R. Gellert R. Rieder 《Space Science Reviews》2007,128(1-4):383-396
The Alpha Particle X-Ray Spectrometer (APXS) is a small instrument to determine the elemental composition of a given sample.
For the ESA Rosetta mission, the periodical comet 67P/Churyumov-Gerasimenko was selected as the target comet, where the lander
PHILAE (after landing) will carry out in-situ observations. One of the instruments onboard is the APXS to make measurements
on the landing site. The APXS science goal is to provide basic compositional data of the comet surface. As comets consist
of a mixture of ice and dust, the dust component can be characterized and compared with known meteoritic compositions. Various
element ratios can be used to evaluate whether chemical fractionations occurred in cometary material by comparing them with
known chondritic material. To enable observations of the local environment, APXS measurements of several spots on the surface
and one spot as function of temperature can be made. Repetitive measurements as function of heliocentric distance can elucidate
thermal processes at work. By measuring samples that were obtained by drilling subsurface material can be analyzed. The accumulated
APXS data can be used to shed light on state, evolution, and origin of 67P/Churyumov- Gerasimenko. 相似文献
455.
张帆 《中国民航飞行学院学报》2012,(4):67-70
基于认知语言学的隐喻构建理论,本文分析了翻译者的受喻者和施喻者双重身份,并且在专业经验和感知选择两个维度上应用自洽工具来翻译隐喻性的民航专业术语,以改进民航专业术语的翻译和教学工作。 相似文献
456.
本文对我院空保专业开办三年来,在学风、生源、就业、设施设备、师资队伍等方面存在的主要问题进行了多角度的调查和分析,剖析了制约空保专业发展的影响因素,进一步提出相应的解决对策和建议,对推动空保专业的发展具有重要的意义。 相似文献
457.
通用航空在服务于国民经济发展方面具有重要的战略意义,而为工业生产建设提供航空飞行服务的工业航空作业是通用航空的重要组成部分,其作用尤为突出.结合中国不同地区自身的地理环境、经济发展等差异,研究各地区对工业航空的需求分布,可为国家制定相关政策、引导市场发展提供了借鉴依据.由于中国长期以来对通用航空缺乏有效监测,各类统计信息不完善,本文基于灰色星座聚类理论,从理论上探讨各地区对工业航空作业的主导需求,具有重要意义. 相似文献
458.
主要研究了美国民用航空规章(FAR)——运输类旋翼航空器适航标准第29.785条“座椅、卧铺、担架、安全带和肩带”的适航条款。首先研究了本条款的起源以及后来的发展历程,即历次修正案;同时分析了各次修正案修改的背景修改内容和修改原因。为航空器设计人员提高对航空器适航的认识提供了辅助性资料,使从事适航工作的人员能够更为准确地把握适航条款的本质目标,缩小与世界适航先进水平的差距。 相似文献
459.
S. Karakula W. Tkaczyk F. Giovannelli 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1984,3(10-12)
In the spherical accretion onto massive objects, the matter may be heated up to temperatures as high as 1012 °K. In such a hot plasma, the thermal bremsstrahlung (e-e and e-p) and π° decay from inelastic collisions of protons are the main γ-ray sources. We determined the γ -ray production spectra from the π° decay and from bremsstrahlung for different temperatures. The expected γ-ray spectra were evaluated too in order to fit experimental data. We have fitted COS B data from 3C 273 using a two temperatures plasma model. The best fit is for
(M8 is the black hole mass in 108 M) which gives
. The hard X-ray measurements do not contradict the bremsstrahlung spectrum. 相似文献
Full-size image (1K)
460.
侯小康 《郑州航空工业管理学院学报(管理科学版)》2003,21(2):30-33
从厂区布局不合理、原材料不能准时供货等方面,分析了机载设备企业生产效率低下的原因。结合航空企业的实际,提出了提高航空机载设备企业生产效率的新思路。 相似文献